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thanks heaps for your quick reply. greatly appreciated. I also forgot to add when it surges/bucks it will not accelerate further usually in the 2500 – 3200rpm zone, and have to release the pedal, if I hold the accelerator at around 20-25% I can pull past the buck zone without any bucking, but the extreme exhaust temps have me worried.
We went through and have checked all the grounds and installed new earth cables from battery to chassis and engine. Also have buzzed out every wire from the ECU to their location and all have full continuity. Has me stumped lol technically with what I have it should run. Engine has 155 PSI compression across all 4 pots.